#include<bits/stdc++.h>
#define XH(i,a,b) for(int i=a;i<b;++i)
#define XXH(i,a,b) for(int i=a-1;i>=b;--i)
#define LL long long
using namespace std;
int tmpINT; string tmpSTRING; char tmpCHAR; double tmpDOUBLE; LL tmpLONGLONG;

int main(){
	int n;scanf("%d", &n);
	int array[n];
	XH(i , 0 , n){
		scanf("%d", &array[i]);
	}
	int visit[n];
	fill(visit,visit+n,0);
	unorder_set<int>st0;
	st0.insert(array[0]);
	XH(i , 1 , n){
		if(array[i]!=array[i-1]){
			st0
		}
	}

	
	return 0;
}